No idea. When I was reporting another bug (copy as details shortcut not working), I noticed that I had two ID panels open (the one floating over the workspace in the screenshot had been on my second monitor, but I dragged it over so both ID panels could be seen simultaneously). I had, at some point prior, set my (then only) ID panel to be floating. I believe subsequent to that I had closed and opened one or two workspaces, but at the time of the screenshot, only a single workspace was open.